Error Handling

Post Example
Examples in Go
Go's panic
by yhuang Go os os.Create
A panic typically means something went unexpectedly wrong. Mostly we use it to fail fast on errors that shouldn’t occur during normal operation, or that we aren’t prepared to handle gracefully.
package main

import "os"

func main() {

    panic("a problem")

    _, err := os.Create("/tmp/file")
    if err != nil {
        panic(err)
    }
}
Return Value after Recover in Go
by yhuang Go fmt fmt.Println fmt.Sprintf
You can return a value after recovering a function by using named result parameters.
package main

import "fmt"

func main() {
	fmt.Println("Returned:", MyFunc())
}

func MyFunc() (ret string) {
	defer func() {
		if r := recover(); r != nil {
			ret = fmt.Sprintf("was panic, recovered value: %v", r)
		}
	}()
	panic("test")
	return "Normal Return Value"
}